Control system.



SL-"h GGNTROL sYsTm/i5 APPLICATION FILED JAN. 5, 1907.

Patanted Aug. 8, i911.

2 SHEETS-SHEET 1.

WITN ESSES:

RJ. P. JACKSON. CONTROL SYSTEM. MPLIGMION fum 1mm, lsorA 999,792 famme. img. a; 19m

SHEETS-SHEET 2.

RAY i. ;rAoKsoN, or WILKINSBURG, rnNNsYLvsivm, Assiettes mo'wnsrmenonsii `:ElI4I|iKHIEBJK`J.Ss MANFACTURING COMPANY, A CRPQRATEGN OF PENNSYLVANIA.

CONTROL sirsrnm.-

y Specification of Letters ll'ateiit.` l p sppiieauon mea Januarys, 19er. serial-n0. esente.

srf'si' Aveiisst Patentes Aug, s, ieri.

To all whom 'it may concern:

BeA itknown that I, RAY P. JACKSON,

l 'citizen of the United' States, and a resident of Wilkinsburg, in v,the y'county of 5 Allegheny andState of Pennsylvanie, have invented anew and usefulr `Ilnprovenient in. 4ontrol lSystems, of 'i'vliichtlie following is a speci-fication.V i

My invention relates to electric control 1e systems, and particularly to those in whicli je plurality oit seperatelyy actuated i main switches or other devicesare employed.

The object of my invention is to provide simple and effective ineens tor preventing siinulteneous closure or operation of two `or more 'switches or devices.

In PatentNoQSStQ, grantedr October 30, 190,6, to thel Westinghouse Electric & `Manufacturing Conipa1iy,.up0n an application tiled by me, is set tortli a voltage-regulating system comprising a transformer having leads extending from severa-l `points thereof, two vinductive windings withineans `for connecting the same to different trans y former leads, and a third inductive Winding having its terminals connected to points -intciniediate the termina-ls `of the other two windings and having a point intermediate its terminals connected to the distributing' ein cuit'. In that system, each of the four ter-- niinals of the first two inductive windings/is y adapted to be connected to a, plurality of.

points in the transformer Winding by ineans of a corresponding number or 'group ofL sep- 35, arately actuated switches and, in orderlto avoid short-circuiting portions of theftransformer Winding, 1t 1s necessary Ato prevent -siinulteneous closure of two or more switches ofv each group.

0 Nhen v.the transformer 4Windin'gis providedy with a'laige number ,of leads and there are, tlieretore, several` switchesin eecli group, the ineens for'pren/exiting simulta-` neous closure of two'or more switches of a i5 group have lieretoiorebeen unduly co1npli-.

cated, and itis accordingly the object 'of'iny present invention to provide a system in which' an unlimited number of switcliesniay be employedywithout increasing the compli- 5t)l cationover other systems in livliclfi'a` smaller number of switches are employed.

.Figurel oty the accompanying drawings is a diagrammatic view of a system ofcontrol theteinbodies my invention, and Fig. 2 is e. diagrammatic View of a system shown in `Fig. l.

portion of tbe A main transformer l .that is suppliedv i ininals out" each ywinding being` connected tof alternate switclies.v intermediate peints ci' `the inductive Windnigs 28 and 29 ere con nectedto the terminals of sfthijrd inductive s conv Winding 30, between an intermediate point l of which and a track rail' 3 ereinterposed suitable translating devices, such as meters 3l, for the propulsion of a Veliicletliiit may y be controlled by the present system.

' The switches lf3 te 27, inclusive,fere pro-l 32 to fli, inclusive, that may either eiect opere-tion thereof directly ci* may control other operating means, tlie magnet windings being slipplied from an auxiliary trans ornierivii'iding The circuits of the magnet windings ere governed, primarily, by means of e master switch d5, and, second ai'ily, by interlocking switches Lijte 57, iii-- cliisive ltliat 'are operated, respectively, by ther switches lil to Zincli'isive,Each-ef they interlocking switches comprises two movable conducting segments andlQ'and four stationary Contact terminals 60, 6,1, 62 and 63 that are adapted to be engaged by the conducting segments:y Thek stationary contactvk terminal. G0 ofeacli of the interlockvided, respectively, with magnet windings,A `l 83 kes ing ysivit'elies is connected, means of e.

conductor 64, `to e. point 65 in tile auxiliary i transformer Winding, lill, end'` each oit the contacttei'ininals 63 is connecte`d`ny means ,of afconductor 6G, to another and'big-lier` Voltage point 67 0i the auxiliary trans-` Vformer Winding', the seine point being also connected to a` 'stationary' Contact, terminal ioc 68 .of the master switeli. Contact terminals 61 ere connected toterininels of tbe inzicfuet windings of the corresponding switches, and

Contact `terminals 62 are divided 'into four' f groups' vof three terminals erich, the respccL .the master switch 45.

tive groups being connected to conductors 69, T0, 71 and 72, in series with which are included resistances 73, 74, 75 and 76, respectively, that are each connected, atvone end, to the track rail 3. The grouping of the contact terminals 62 corresponds to the grouping ot' the terminals of the main switches 16 to 27, inclusive, that are connected to the terminals of the inductive windings QS and Q9.

In the operation of the system, the master switch l'is first moved to the position indicated by the broken line a, magnet windings 32 to 35, inclusive, being thereby connected between the high voltage point 67 :ind the truck rail 3, with the resistances 7 3 to 76, respectively, in series therewith. The switches 16 to 19, inclusive, are then closed, and the inductive winding 28 is connected between transformer leads 12 and 14, while the inductive winding 29 is connected -between the alternate leads 13 and 1 5. As interlocking switches 16 to 4S, inclusive, are moved upwardly, the magnet windings 32 to S5 become connected between the points and 67 ot the auxiliary transformer winding 44., while tlicresistances 73 to 76, inclusive, are connected between the point 67 of the transformer 4t and the track rail 3, this circuit being established independently of The resistances 73 to 76, inclusive, are of such value that, when they are connected in series with the magnet windings', only sutlicient current is permitted to traverse the windings to cause operation of the switches and, when they are connected between the lead 67 and the'track rails, only a slightly lai-ver amount of current is per- ,initted to flow, whereby shoit-circuiting of the auxiliary transformer windingis prevented. That is, the i'esistances of the mag net windings will usually be small as coinpared with that of the devices 73 to 76. If the master switch is moved to position b, the circuit of magnet uv'inding 32 is interrupted thereby, and the circuitl of magnet Winding 36 is established, the switch 2O being thereby caused to close. If, however, the switch 16 should stick or not open readily, inter- `locking switch L16 will provide a low resistance shunt for the magnet winding 36 Aand prevent energizing thereof to a suflicient degree to cilect operation of the switch 20. This may be best understood by referring to Fig. in which only one'group ofr switches and a portion ot' the system has been shown.. As shown in this ligure, if the magnet .i'nding 3:2 is energized its circuit `will be by way of devices bearing reference characters 67, Lio, 32, 6l, 58, 60, 64 and 65,

the winding being connected between points a 'd 67' ofi5 the auxiliary trensfn'mer wind- "Vlie resistance, 7"

.s is connected bepoint 67 in the auxiliary transformer u-'indiiig i4, and the track rail 3 by means of a circuit comprisin devices 67, 66, 63, 59, 62 and73. When t 'ese conditions prevail, if it isdesired to energize the magnet winding 36 and cause closure of the switch 20, the master switch should be moved so as to establish a circuit by way of devices 67, 4 5, 36, 61a, 58?, 62, 69, 73 and 3. However, if the switch 16 refuses to open or delays in opening for any reason, the magnet winding36 becomes connected to the terminal of the resistance 73 that is connected directly to the point 67, by means of the nter,

locking switch 46, so that it will be shunted by a low. resistance path and will not be supplied with a suicient amount of current to effect closing of the switch 20. Thus,

while any one of the switches 16, 2O or 24, :comprising one of the groups of switches, remains closed, the-other switches of the group cannot be closed because the magnet windings thereof are shunted.A The switches of each of the groups are interlocked against.

each other iii the same manner as the roup shown in Fig. 2 and the operation of t e remainder of the system is exactly similar to that of the group just described. It will, of course, be understood that the object in preventing simultaneous closure of two or more switches ot' a group is to prevent short-circuiting. of portions of the transformer Winding that might otherwise result, yas 4Will be seen from an inspection of Fig. 1, and of the above mentioned Patent No. 834,525 in which the remainder of the system is fully set forth.

W'hile the invention has been shown and described as employed in 'connection with a particular system of Voltage lregulation it will, of course, be understood that it is not limited to such specific application, and also that it may be employed in the control of other devices than electrical switches.

I claim :is my invention:

1. The .combination witlna plurality of separately actuated devices and controlling magnet windings therefor, of means operated by each ot' the said devices to providel shunts for the windings pertaining to all' the other devices.

2. The combination with a plurality of separately actuated. deuices and controlling magnet windings therefor, yof a master switch for governing the circuits of the con- 'trolling magnet windings, and means operated by each of said devices to provide shunt circuits to the circuits that may be established by the master switch through the windings pertaining to any'or all of the other devices.

,The combination with a plurality of separately actuated devices, controlling:

ma net windings therefor, a source having a plurality of leads extending therefrom and a resistance, of means for connecting the magnet windings in series with the resist- FIO :mee betwn 11 pair of lends 110111 tlm Source,

-1111d-11'1ez11151I upm-Med by the devices for c011- nectingtlw windings belwccn another p11i1 of leads from the simu-cc7 :zml im' :0111'1cv1111gthe resistance, A101111 liclix'eeii the aforesaid leads.

4. The 'c0111l1i1111ii1111 with 11 plurality nl separately actuated. devizzemt? Controlling muguet winding tl1ei'fo1, 11 Source of 11111lti Yqltage and f1 reSistunce, und 111ca111S for c011- nefztixig thc magnet windings i11 series with the resistance between high voltage terminuls of the source, 111011115` opurnlwl 'by the dc- \'i ;Q foi' conncviing tllvy windings, liclwwn low witzige l01111i1111lhl of tlm S0111@ :111 l l'or connculiug' llic resistance :110110 between thv aforesaid lends.

subscribed 111y 11111110y lliis 31st. rluy ol' Dumm,- ber, 1906.

RAY l). JACKSON. Tituesscs R. J. Dmnnoux,

Bumm' -limcs. 

